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…l draw on it In ChatGPT, render_map_tool opens its map as a tab next to the chat that stays open: - A thread entrypoint opens an empty map. - The map shares its view and the selected place (a pin, a search result or a Standard base map label) as model context. - WebMCP tools (redraw_map, search_map, add_places, move_map, read_map) let the model change the open map instead of opening another. - The server instructions, tool description and results point the model at those tools.
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…apAppHtml.ts mapAppHtml.ts had grown past 3,300 lines. The new map page code now lives in three files whose scripts renderMapAppHtml splices into the page's single <script>. The generated page's code is unchanged.
ChatGPT on the web offers document.modelContext but doesn't give the registered tools to the model, so a map that listed them in its context had the model explain that the tools it was told about weren't callable. The context no longer lists them, and the server texts say ChatGPT Desktop.
…ender_map_tool an icon On a phone, ChatGPT's title bar covered the map's zoom buttons and summary. The map now places its controls, labels and cards inside hostContext.safeAreaInsets, while the map itself runs underneath, and inline it asks for no more than containerDimensions.maxHeight. A square Mapbox mark icon replaces the wide server logo in ChatGPT's "+" menu.
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In ChatGPT,
render_map_toolopens its map as a tab next to the chat, where it stays open and works with the conversation. Hosts without the OpenAI MCP Extensions ignore the new metadata.render_map_toolis a thread entrypoint. "+" → "More tools" → Mapbox Map opens an empty map.ui/update-model-context, and the selected place as a titled item in the composer, so "what's around here?" and "what is this?" work. A place can be a pin, a search result, or a label of the Standard base map: points of interest, place names, landmark icons and indoor labels. A selected label is highlighted; a second click deselects it.redraw_map,search_map,add_places,move_mapandread_map, so follow-ups draw on the open map instead of opening another.redraw_maptakesrender_map_tool's arguments.render_map_tooldescription, the render hint and the map's shared context name these tools, each saying it applies in ChatGPT, so other clients aren't sent looking for tools they don't have. In ChatGPT, the result of a call that opens a map names them too.Verified in ChatGPT Desktop with a local dev server: the map opens next to the chat and from the thread tab bar; the model answers from the shared view; in Codex, follow-ups change the open map; clicking base map labels selects, switches and deselects them, and the selection stays after a message is sent. With the tools named directly (no
read_mapcall first), "show coffee shops on it" drew on the open map throughsearch_map, without a secondrender_map_toolcall. Unit tests, typecheck and lint pass.Known limits: